题目内容
计算,(能用简便方法计算的要用简便方法计算)
| (1)10.1×87 | (2)2.3+3.19÷(22-19.8) | (3)1.25×7.2. |
解(1)10.1×87,
=(10+0.1)×87,
=87+8.7,
=95.7;
(2)2.3+3.19÷(22-19.8),
=2.3+3.19÷2.2,
=2.3+1.45,
=3.75;
(3)1.25×7.2,
=1.25×8×0.9,
=10×0.9,
=9.
=(10+0.1)×87,
=87+8.7,
=95.7;
(2)2.3+3.19÷(22-19.8),
=2.3+3.19÷2.2,
=2.3+1.45,
=3.75;
(3)1.25×7.2,
=1.25×8×0.9,
=10×0.9,
=9.
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